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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Assessment of insulation condition of generator stator bars based on velocity of ultrasonic waves
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Assessment of insulation condition of generator stator bars based on velocity of ultrasonic waves

机译：基于超声波速度的发电机定子线棒绝缘状态评估

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摘要

The velocity of ultrasonic waves, which were launched using the pulse-echo method and propagated in a stator insulation, was measured to assess the insulation condition of the stator bars. A statistical minimum velocity (V/sub min/) and a statistical average velocity (V/sub av/) were computed for a new and three sets of stator bars which were in operation for 16, 18 and 23 years. After velocity measurements, several conventional electrical parameters such as dissipation factor, capacitance, and partial discharge were measured, and microscopic examinations of dissected insulation of tested bars were examined with a scanning electron microscope and an optical microscope. Experimental results showed that V/sub min/ and V/sub av/ decreased and more microscopic defects were formed in the insulation with increasing operating time of the stator bar. For the three sets of aged stator bars, the insulation conditions based on Y/sub min/ and V/sub av/ were consistent with those assessed by measuring electrical diagnostic parameters. Therefore, Y/sub min/ and V/sub av/ were used to assess the insulation condition of large generators. The measurement of ultrasonic waves may offer a broad prospect for stator insulation diagnosis.
机译：测量了使用脉冲回波法发射并在定子绝缘中传播的超声波的速度，以评估定子棒的绝缘条件。计算了新的和三组运行了16、18和23年的定子棒的统计最小速度（V / sub min /）和统计平均速度（V / sub av /）。在进行速度测量之后，测量了一些常规的电参数，例如耗散因数，电容和局部放电，并使用扫描电子显微镜和光学显微镜对被测棒的绝缘层进行了显微镜检查。实验结果表明，随着定子棒工作时间的增加，V / sub min /和V / sub av /减小，并且在绝缘层中形成了更多的微观缺陷。对于三组老化定子线棒，基于Y / sub min /和V / sub av /的绝缘条件与通过测量电气诊断参数评估的绝缘条件一致。因此，使用Y / sub min /和V / sub av /来评估大型发电机的绝缘状况。超声波的测量可能为定子绝缘诊断提供广阔的前景。

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